diff --git a/src/urh/dev/Device.py b/src/urh/dev/Device.py
index 6855d07f..f015e2d5 100644
--- a/src/urh/dev/Device.py
+++ b/src/urh/dev/Device.py
@@ -18,7 +18,7 @@ class Device(metaclass=ABCMeta):
         self.current_index = 0
         while True:
             try:
-                self.receive_buffer = np.zeros(int(buf_size), dtype=np.complex64)
+                self.receive_buffer = np.zeros(int(buf_size), dtype=np.complex64, order='C')
                 break
             except (MemoryError, ValueError):
                 buf_size //= 2
diff --git a/src/urh/dev/HackRF.py b/src/urh/dev/HackRF.py
index de95f5ef..f2ca674b 100644
--- a/src/urh/dev/HackRF.py
+++ b/src/urh/dev/HackRF.py
@@ -12,8 +12,8 @@ class HackRF(Device):
         self.is_open = False
         self.success = 0
 
-        self.__lut = np.empty(0xffff + 1, dtype=np.complex64)
-        self.little_endian = True
+        self.__lut = np.zeros(0xffff + 1, dtype=np.complex64)
+        self.little_endian = False
         for i in range(0, 0xffff + 1):
             if self.little_endian:
                 real = (float(np.int8(i & 0xff))) * (1.0 / 128.0)
diff --git a/tests/HackRF.py b/tests/HackRF.py
index 9178038c..1b0e4138 100644
--- a/tests/HackRF.py
+++ b/tests/HackRF.py
@@ -70,17 +70,15 @@ class TestHackRF(unittest.TestCase):
 
 
     def test_hackrf_class(self):
-        hfc = HackRF(1e6, 433e6, 20, 10e6)
+        hfc = HackRF(1e6, 433.92e6, 20, 1e6)
         hfc.open()
         hfc.start_rx_mode()
         time.sleep(5)
         print(hfc.current_index)
         print(hfc.received_data)
-        hfc.stop_rx_mode("Finished test")
         hfc.received_data.tofile("/tmp/hackrf.complex")
         print("Wrote Data")
-
-
+        hfc.stop_rx_mode("Finished test")
         hfc.close()
 
     def test_lookup(self):